Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c52f0a32ae6b37b…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 16:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04ec35a1eac42a768dbe24323f19c478 SHA-1: b7e1e8bb2db8a920fa12aec479b30c0bf69c860a SHA-256: 6c52f0a32ae6b37b3633a39b7626c0a2d6805e0f4cc10847d740a0d0d5edfba8
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains multiple links to external websites, with one heuristic specifically identifying it as a link farm on disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ssaisarang.com/ckfinder/userfiles/files/fomivutokewegadafetuwuzub.pdf In PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/61065446216.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/57052397675.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/42159244993.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/subexurisapiluduzivujob.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/rogatuvij.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/5418949066.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/65030804901.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/60321238518.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawosawemudoxovaxugejib.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/suzigasi.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/56254914471.pdfIn PDF document text
    • https://ocw.tw/uploads/files/mifajidobizofelixit.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/wuzanozipakasuwif.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/5740391021.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137c9549c9a5---11662724332.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/pv0c86a76dboa0dc6tr3apl0i4/32043539366.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/rezuzav.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/rezijimakupitafijumifibex.pdfIn PDF document text
    • http://chapelguild.com/images/usr/48967745811.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/53599391785.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/15512221444.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/42293533308.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/46928612298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+do+i+retrieve+my+macbook+passwordPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 11012 bytes
SHA-256: c83b8093d36800f7c4aea0c8d58902699c9eb84e21523e78d8e70664e97c6530
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 17048 bytes
SHA-256: 881c02838e0c1e3607ef0f9c98f9a774402bdbb3c589237bce180c9bc4d2535d